Flash video stops after a few seconds in Firefox

Issue

For some Firefox browser users, Adobe Flash video content (such as from www.youtube.com) begins, but stops playing aftera few seconds.

Reason

This is a known issue with Flash Player 9. It can be caused by a number of factors:

Having more than 15 instances of Adobe Flash Player running in Firefox. With multiple tabs and many sites featuring ads delivered as Flash content, it is fairly easy to have more than 15 instances in memory.

Having certain hardware drivers that may be corrupt. For example, some users have reported this issue when they had older PCI cards installed, but removing those particular cards resolved the issue.